Carburetor (BBD) - new or rebuild?

I am dealing with one now a knock off that basically flooded the engine enough to cause an explosion in the exhaust and blow the muffler open. And the owner of the car is going to buy another one LOL! At this point evidence indicates he gas washed his cylinders, blew his muffler apart and had an underhood fire... and he wants to buy another one instead of rebuilding his priginal BBD. What I have found in my research suggests that if the throttle shafts aren't worn etc. you should be able to rebuild a original BBD or you can use the base off the knopck off peice and put it on your original fuel bowl and air horn assembly.